Dovecot 2.2.10 Centos 7 Linux 3.10.0-514.26.2.el7.x86_64 #1 SMP Tue Jul 4 15:04:05 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

I have been experimenting with backup options to another server using dovadm and was trying to use the doveadm service as a workaround seeing as I couldn't decipher what the docs were saying about ssh.

My doveadm stanza looks as follows:

service doveadm { inet_listener { port = 10101 ssl = yes } }

If "ssl=no", a pushed "doveadm backup" from the remote machine works OK.

But if I enable SSL, the doveadm backup on the remote machine hangs. And the destination machine prints the following two massages in the logs :

Aug 4 17:10:31 bbb dovecot: doveadm: Error: Corrupted SSL parameters file in state_dir: ssl-parameters.dat - disabling SSL 360 Aug 4 17:10:31 bbb dovecot: doveadm: Error: Couldn't initialize SSL parameters, disabling SSL

BUT :

(1) /var/lib/dovecot/ssl-parameters.dat *DOES* exist. and (2) If I delete it and restart dovecot, it successully re-creates it, as per Aug 4 17:02:32 bbb dovecot: ssl-params: Generating SSL parameters Aug 4 17:06:58 bbb dovecot: ssl-params: SSL parameters regeneration completed